An extraterrestrial impact is most closely linked to the Cretaceous extinction event.

天外来客对地球的撞击与白垩纪的物种灭绝事件有着最为密切的联系。

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The mass extinction event killed off the dinosaurs and many other animal and plant species.

中找到了元素铱岩层，而这通常会被发现于小行星中。 这次灭绝事件杀光了恐龙以及许多其他动植物物种。

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Of course, humanity is currently setting off the sixth mass extinction event in Earth's history.

当然，人类正在引发地球历史上第6次物种大灭绝。

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Our species hasn't been around long enough to experience a cataclysmic extinction event.

CNN: Space's threat to civilization

Either it's going to become multiplanetary, or it's going to be confined to one planet until some eventual extinction event.

WSJ: An Electric Car and a Trip to Mars

Scott Kenemore, author of "The Zen of Zombie" and a member of the advisory board of the Zombie Research Society, said the zombie apocalypse can represent a validation of sorts for people awaiting their particular extinction event.

CNN: Apocalypse believers' big finish predictions vary